Хемијска веза — разлика између измена

* {{Cite book |ref= harv|title=Valency and bonding| publisher=Cambridge | year=2005 |pages=96–100 | author=Weinhold, F.; Landis, C. | isbn=0521831288|ref=harv}}

* {{Cite book |ref= harv|last = Atkins| first = Peter | coauthors = Loretta Jones | title = Chemistry: Molecules, Matter and Change | publisher = W. H. Freeman & Co. | year = 1997 | location = New York | pages = 294–295 | isbn = 0-7167-3107-X |ref=harv}}